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DEPOSITS - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Deposits Liabilities, Balance Sheet, Reported Amounts [Abstract]
Time deposits, at or above FDIC insurance limit	$ 277	$ 265
Public funds included in deposits	$ 319	$ 315

X

- Definition

Public Funds Included in Deposits

+ References

No definition available.

+ Details

Name:	hmst_PublicFundsIncludedInDeposits
Namespace Prefix:	hmst_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_DepositsLiabilitiesBalanceSheetReportedAmountsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of time deposit liabilities, including certificates of deposit, in denominations that meet or exceed the Federal Deposit Insurance Corporation (FDIC) insurance limit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 405
-Topic 942
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478353/942-405-50-1

+ Details

Name:	us-gaap_TimeDepositsAtOrAboveFDICInsuranceLimit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant